Automatic double headstock with reversing movement



July 16, 1929. J, LEFLAIVE 1,721,078

AUTOMATIC DOUBLE HEADSTOCK WITH REVERSING MOVEMENT Filed Feb. 8, 1925 9 Sheets-Sheet l ATTORNEY J. LEFLAIVE 1,721,078

AUTOMATIC DOUBLE HEADSTOCK WITH REVERSING MOVEMENT July 16, 1929.

Filed Feb. 8, 1923 9 Sheets-Sheet 2 INVENTOR ATTORNEY July 16, 1929.

AUTOMATIC DOUBLE HEADSTOCK WITH REVERSING MOVEMENT J. LEFLAIVE Filed Feb. 8, 1923 9 Sheets-Sheet 5 INVENTQR. Joseph Le] e A TTORNE Y.

July 16, 1929. J. LEFLAIVE 1,721,078

AUTOMATIC DOUBLE HEADSTOCK WITH REVERSING MOVEMENT Filed Feb. 8, 1923 9 Sheets-Sheet 4 INVEN OR ATTORNEY J. LEFLAIVE July 16, 1929.

AUTOMATIC DOUBLE HEADSTOCK WITH REVERSING MOVEMENT Filed Feb. 8, 1923 9 Sheets-Sheet- I N V EN TOR. k bSeph zZX will A TTORNEY J. LEFLAIVE July 16,

AUTOMATIC DOUBLE HEADSTOCK WITH REVERSING MOVEMENT 9 Sheets-Sheet 6 Filed Feb. 8, 1923 VENTOR ATTORNEY July 16, 1929. J. LEFLAIVE 1,721,078

AUTOMATIC DOUBLE HEADSTOCK WITH REVERSING MOVEMENT Filed Feb; 8, 1925 9 Sheets-Sheet 7 July 16, 1929. J. LEFLAIVE 1,721,078

AUTOMATIC DOUBLE HEADSTQCK WITH REVERSING MOVEMENT Filed Feb. 8, 1923 9 Sheets-Sheet 8 July 16, 1929. J. LEFLAIVE AUTOMATIC DOUBLE HEADSTOCK WITH REVERSING MOVEMENT Filed Feb. 8, 1923 9 Sheets-Sheet 9 \\\\llllll Patented July 16, 1929.

7 UNITED STATES 1,721,078 PATENT OFFICE.

JOSEPH LEFLAIVE, OF LA CIIALEASSIERE, ST.ETIENNE, FRANCE, ASSIGNOR TO SO- CIE'I'E ANONYME DES ETABLISSEMENTS LEFLAIVE, OF LA CHALEASSIERE, ST.- ETIENNE, LOIRE, FRANCE, A CORPORATION OF FRANCE.

AUTOMATIC DOUBLE HEADSTOCK WITH REVERSING- MOVEMENT.

Application filed February 8, 1923, Serial No. 617,733, and in France December 5, 1922 The arrangement of headstock which forms the subject matter of the present invention, although adaptedfor use 011 various machine tools, is more particularly desi ned to allow of cutting simultaneously, on a leason machine, such, for example, as the machine illustrated in United States Letters Patent to Gleason et al., No. 1,203,608, granted November 7, 1916, two bevel wheels with show teeth by the same milling cutter and the arrangement, after certain modifications have been made in the machine, can out even four gear wheels simultaneously.

The figures annexed hereto comprise:

Figure 1 a diagram giving the position of the two gear wheels and of the milling cutter in the arrangement according to this inven tion.

Figure 2 is an elevation of the arrangement giving the position of the gear wheels with relation to the milling cutter.

Figure 3 is a corresponding plan view thereof.

Figures 4, 1 are elevations of the arrangement adapted to be mounted on a Gleason machine.

Figures 5 and 5 are corresponding plan views thereof.

Figure 6 is a view of the mechanism for driving the spindles which carry the gear wheels.

Figures 7 and 8 indicate diagrammatically the way in which the arrangement could be used for the simultaneous cutting of four gear wheels.

Figs. 9, 10 and 11 show the application of the mechanisms to the Gleason machine, the latter being illustrated in dotted lines.

For a complete description of the Gleason machine to which the present improvements relate, reference may be had to United States Patent No. 1,203,608, above referred to.

The principle on which the arrangement is based will be described with reference to the diagram (Figure 1). It consists essentially in the fact that the two gear wheels to be out are fixed to the ends of two headstocks to which equal movements are imparted which are symmetrical and can be reversed. They are placed diametrically opposite to each other relatively to the milling cutter taking account of the fact that this latter attacks the gear wheels on two opposite faces of the cone so as to produce the same direction of curvature of the teeth as shown in Figures 2 and 3.

In Figure 1, the upper gear wheel is placed in the same position as in the normal machine. The milling cutter being regulated with respect to this gear wheel, it suffices to cause the second gear wheel to move in a vertical plane so that it accompanies the milling cutter in its circular movement I; 0 (Z. The figure represents the extreme positions 6 and d and also the intermediate position 0 of the milling cutter and of the second gear wheel. The thick lines indicate the corresponding cuts made in the gear wheels. The arrows indicate the direction of rotation of the various parts during the cutting period.

The vertical rectilinear movement of the carriage which carries the gear wheels and which compensates for the relative circular movement of the milling cutter can be obtained by means of an adjustable connecting rod which permits of the admission of Wheels of different diameters.

The arrangement by connecting rod not being the only one which is applicable it is advantageous to contemplatelikewise in the present invention all the arrangements, the object of which is to transform the relative circular movement of the milling cutter into an alternating rectilinear movement of the pinion as by a cam and roller for example or by any other means.

Figures 2 and 3 indicate very clearly the position occupied during the cutting operation by the wheels R-R relatively to the milling cutter 20, the arrows indicating also the direction of rotation of the various parts.

Referring to Figures 4, 4 5, 5 and 6, a description will now be given of the apparatus according to this invention as applicable for example to a machine of the Gleason type.

In this case, the first headstock carrying carriage 1 oscillates on the table of the machine on the axle 0, through the medium of the hub 2, and the second carriage 3 oscillates also on the table on the same axle 0 being centred on the hub 2. A square 4 which catches against the inner edge of the table ensures the stability of the system.

In order to obtain rotation of the carriage about the axle O which may be equal, but opposite with respect to the axis X-Y (Fig. 5 of the machine, the spur pinion 5 rotates on a spindle fixed to the table and transmits the control of the carriage 3 to the carriage 1 through the medium of toothed sectors 6, 7 fixed to the bases of the carriages.

The carriage 3 carries the headstock 8, the height of the centre of which is fixed corresponding as in the simple machine to the axle of the cradle of the machine. Its shaft 9, on the end of which is placed the first wheel to be out, receives the movement of the machine through the medium of the sets of bevel pinions 10, 11, 12 and of the wheel and endless screw system 13. A slide driving mechanism 14 permits of the movement of the headstock 8 on the carriage 3, so as to advance or retire the article which is to be cut.

The carriage 1 carries the second headstock 15 through the medium of another carriage 16. The shaft 17 receives the second wheel to be cut. This headstock has imparted to it a vertical rectilinear movement which compensates the circular movement of the milling cutter. This movement is obtain ed by means of the connecting rod 18, mounted on the spindle 19 fixed in the spindle 20 which carries the milling cutter, the oscillatory movement of the spindle 19 vertically moving the shaft 17 to the positions corresponding tt 7), c, and (Z on Figure 1, the headstock and shaft being guided in the angular guideways shown in Figures 5 and 5. The fixed headstock has been swung 180 degrees in Fig. a to clarify the showing. The connecting rod is of adjustable length which allows of teeth which have a different spiral angle being out. A counterweight 21 counterbalances the weight of the headstock 15 and of the spindle 17 which carries the wheels.

The spindles 9 and 17 which carry the parts have a skew toothed wheel and pinion movement 22, transmission being ensured by a Oardan and a sliding clutch 23.

The diagrams 7 and 8 relate to an application of the arrangement which has just been described to a machine which can out four skew toothed gear wheels simultaneously. In this case, the machine of the Gleason type would have to undergo very considerable modification.

In this machine, the shaft will have two milling cutters, that is to say, one at each of its ends. It will have two tables T, T of semicircular form, each correspondingto a milling cutter, the movements being eflaced by leaving the half tables free.

Each of the two tables will be provided with a double gear wheel carrying device so as to permit of the cutting ottwo wheels at once on each side R-R and R -R or four at the same time. The shaft or spindle which carries the milling cutters may oscillate or not. In the first case it will suffice to instal, symmetrically with the axis of the machine, two headstocks of the double type exactly similar to that of the arrangement described. In the second case, it will suiiice to impart to the two groups of milling cutter carrying headstocks a circular movement which permits of skew teeth being obtained.

Claims:

1. In a machine for cutting skew bevel gears, two headstocks for carrying a plurality of gear blanks, a milling cutter shaft having a circular oscillatory movement, a milling cutter mounted on said shaft, one of said headstocks being mounted on a fixed axle, the other of said headstocks being mounted on an oscillating axle, and means for oscillating the latter axle to compensate for the oscillatory movement of the milling cutter shaft.

2. In the combination set out in claim 1, said means comprising an adjustable connecting rod associated with said milling cutter shaft and said last named headstock.

In testimony whereof I afiix my signature.

JOSEPH LEFLAIVE. [L.S.]. 

